/Engine/Source/Runtime/AssetRegistry/Public/AssetRegistry/IAssetRegistry.h
Returns the names of all classes derived by the supplied class names, excluding any classes matching the excluded class names. This can be slow if temporary caching mode is not on
void GetDerivedClassNames ( const [TArray](API\Runtime\Core\Containers\TArray)< [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) > & ClassNames, const [TSet](API\Runtime\Core\Containers\TSet)< [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) > & ExcludedClassNames, [TSet](API\Runtime\Core\Containers\TSet)< [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) > & OutDerivedClassNames ) const